<template>
    <div class="app-container">
        <!-- 顶部 -->
        <mt-header fixed title="CMS">
            <div @click="goBack" slot="left" v-show="flag">
                <mt-button icon="back">返回</mt-button>
            </div>
        </mt-header>

        <!-- 中间 -->
        <transition>
            <router-view></router-view>
        </transition>


        <!-- 底部 -->
        <nav class="mui-bar mui-bar-tab">
            <router-link   class="mui-tab-item-llb" to="/home">
                <span class="mui-icon mui-icon-home"></span>
                <span class="mui-tab-label">首页</span>
            </router-link>
            <router-link  class="mui-tab-item-llb" to="/member">
                <span class="mui-icon mui-icon-contact"></span>
                <span class="mui-tab-label">会员</span>
            </router-link >
            <router-link  class="mui-tab-item-llb" to="/shopcar">
                <span class="mui-icon mui-icon-extra mui-icon-extra-cart">
                    <span class="mui-badge" id="badge">{{ $store.getters.getAllCount }}</span>
                </span>
                <span class="mui-tab-label">购物车</span>
            </router-link >
            <router-link  class="mui-tab-item-llb" to="/search">
                <span class="mui-icon mui-icon-search"></span>
                <span class="mui-tab-label">搜索</span>
            </router-link >
        </nav>
    </div>
</template>

<script>
    export default {
        data () {
          return {
              flag: false
          }
        },
        created () {
            // 确保在刷新后返回按钮不会消失
          this.flag = this.$route.path === '/home' ? false: true;
        },
        methods: {
            goBack() {
                // 后退
                this.$router.go(-1);
            }
        },
        watch: {
            '$route.path': function () {
                // 如果是首页就隐藏按钮
                if (this.$route.path === '/home') {
                    this.flag = false;
                } else {
                    this.flag = true;
                }
            }
        }
    }
</script>

<style scoped>
    .app-container{
        padding-top: 40px;
        overflow-x: hidden;  /**隐藏横向溢出的元素**/
        padding-bottom: 50px;
    }

    .v-enter {
        opacity: 0;
        transform: translateX(100%);
    }
    .v-leave-to {
        opacity: 0;
        transform: translateX(-100%);
        position: absolute;
    }

    .v-enter-active,
    .v-leave-active {
        transition: all 0.4s ease;
    }


    /** mui-tab-item要改为mui-tab-item-llb，以为mui的图片分享顶部标题滑动样式会导致这里的tabbar滑动不了 **/
    .mui-bar-tab .mui-tab-item-llb.mui-active {
        color: #007aff;
    }
    .mui-bar-tab .mui-tab-item-llb {
        display: table-cell;
        overflow: hidden;
        width: 1%;
        height: 50px;
        text-align: center;
        vertical-align: middle;
        white-space: nowrap;
        text-overflow: ellipsis;
        color: #929292;
    }
    .mui-bar-tab .mui-tab-item-llb .mui-icon {
        top: 3px;
        width: 24px;
        height: 24px;
        padding-top: 0;
        padding-bottom: 0;
    }
    .mui-bar-tab .mui-tab-item-llb .mui-icon ~ .mui-tab-label {
        font-size: 11px;
        display: block;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .mint-header {
        z-index: 99;
    }

</style>
